book Maths Puzzle Numerical Ability

The driver of a car with a leaking radiator found it necessary to add water twice on a trip. The radiator held 120 liters and was filled with a 30% alcohol solution at the start. A

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Hello. My name is kate and i was wondering if you could help me understand and complete these two problems.
For the expression 2x^2 - 5x + 2
A.Find the value of x if the Show that for s (semiperimeter), r(radius of inscribed circle), and r 9radius of circumscribed circle), abc = 4srR.